[填空题]
A potter’s wheel is rotavvg 3zp pb;(7vting around a vertical axis qdzec. /2bc jm+a9n (lthrough its center at a frequency of 1.5rev/s The wheel can be considered a uniform disk of mass 5.0 (/+l j.eba9c2 cqndzm kg and diameter 0.40 m. The potter then throws a 3.1-kg chunk of clay, approximately shaped as a flat disk of radius 8.0 cm, onto the center of the rotating wheel. What is the frequency of the wheel after the clay sticks to it? $rev/s$